Protect your Cal ID calendar from spam bots and malicious scripts by adding a Cloudflare Turnstile captcha challenge to your booking page.
Add a captcha challenge to your booking page to keep automated bots and malicious scripts from flooding your calendar with fake appointments.In Cal ID, the Enable captcha on Booking page feature is a vital security layer designed to protect your calendar from automated spam bots and malicious booking scripts.
Captcha is bot protection for your booking page: it verifies that a real person — not an automated script — is submitting the booking, so scrapers and bots can’t snatch slots or fill your schedule with junk.
Bot Mitigation: Prevents automated bots from flooding your schedule with fake appointments, ensuring your availability is reserved for real clients.
Protect Public Links: Essential for “Discovery Calls” or booking links that are openly accessible to web scrapers.
Prevent “Denial of Service” on Slots: Bots can be used to “snatch” every available slot in seconds to prevent others from booking. Captcha blocks these scripts.
Clean Data: Keeps your dashboard and connected CRM free from junk data and “trash” leads.
Frictionless Experience: Cal ID uses Cloudflare Turnstile. For most bookers, the check happens silently in the background without them having to do anything.
Interactive Challenges: If the booker’s browser behavior appears “bot-like,” the system presents a short interactive challenge that they must complete before clicking “Confirm Booking”.
Strength Impact: At High strength, the system is much more sensitive, which increases security but may cause slight delays for legitimate bookers.
If you are using Requires booker email verification alongside Captcha, your booking page will be highly secure. However, keep in mind that every extra step (Captcha + Email Verification) adds “friction.” For internal team links or private 1-on-1s, we recommend keeping these settings at Medium or Low to ensure a smooth booking flow.
